"Iman always told the story in such a charming way, 'It took two blondes to get me pregnant David Bowie and Christie Brinkley!'" the 61-year-old Instagrammed on Tuesday. "You see, Iman explained to me, 'In Somalia, they say if you are having trouble getting pregnant you must hold a baby all day.' So, I handed her my baby, Sailor, and she held her all day long."

Photos of Iman and David Bowie together through the years:

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David Bowie and Iman together through the years

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Christie Brinkley shares how she helped David Bowie's wife Iman get pregnant

David Bowie and Iman (Photo by Kevin Mazur/WireImage)

David Bowie and Iman in Wembley, London, United Kingdom. (Photo by Kevin Mazur/WireImage)

Iman and David Bowie (Photo by Rose Hartman/WireImage)

Iman and David Bowie during Eduard Nakhamkin Fine Arts Gallery Benefiting The American Cancer Society - November 27, 1990 at Eduard Nakhamkin Fine Arts Gallery in New York City, New York, United States. (Photo by Ron Galella/WireImage)

David Bowie and Iman during Eduard Nakhamkin Fine Arts Gallery Benefiting The American Cancer Society - November 27, 1990 at Eduard Nakhamkin Fine Arts Gallery in New York City, New York, United States. (Photo by Ke.Mazur/WireImage)

David Bowie and Iman at the 69th Regiment Armory in New York City, New York (Photo by Ron Galella/WireImage)

Iman and David Bowie during '7th On Sale' To Benefit AIDS Research - November 29, 1990 at 69th Regiment Armory in New York City, New York, United States. (Photo by Ron Galella/WireImage)

Iman and David Bowie during David Bowie and Iman at Spago's Restaurant - April 4, 1991 at Spago's in West Hollywood, California, United States. (Photo by Ron Galella, Ltd./WireImage)

PARIS, FRANCE - SEPTEMBER 18: Iman and David Bowie at Les Bains douches during a soir?e dedicated to Francesca Dellera, on 18th September 1991 in Paris.(Photo by Alexis DUCLOS/Gamma-Keystone via Getty Images)

David Bowie and his wife Iman - 'Bulgari' party in Paris - 1991. (Photo by Bertrand Rindoff Petroff/Getty Images)

Iman and David Bowie during Unveiling of the 1991 Holiday Windows at Barneys at Barneys in New York City, New York, United States. (Photo by Ron Galella, Ltd./WireImage)

David Bowie and Iman outside a theater, New York, New York, 1992. (Photo by Rose Hartman/Getty Images)

LONDON - APRIL 20: Musician David Bowie and wife Iman at his art show on April 20, 1995 in London. (Photo by Dave Benett/Getty Images)

Iman and David Bowie (Photo by Ron Galella, Ltd./WireImage)

Iman and David Bowie (Photo by Ron Galella, Ltd./WireImage)

Iman and David Bowie during 6th Annual New York Shakespeare Festival Benefit at Manhattan Center in New York City, New York, United States. (Photo by Ron Galella/WireImage)

UNITED STATES - SEPTEMBER 27: Iman and husband David Bowie auctioning off celebrity plates to benefit Childrens Defense Fund's Black Community Crusade for Children at Denise Rich's penthouse. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)

Iman and David Bowie during David Bowie's 50th Birthday Celebration Concert at Madison Square Garden in New York City, New York, United States. (Photo by KMazur/WireImage)

UNITED STATES - FEBRUARY 03: Iman and David Bowie are on hand for the 16th annual CFDA Awards Gala at the New York State Theater. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)

HOLLYWOOD, CA - FEBRUARY 12: Rock music superstar David Bowie (R) and his wife, supermodel Iman smile as they pose for photos after Bowie received a star on the world famous Walk of Fame 12 February in Hollywood, CA. Bowie, whose changing persona has marked him as one of rock music's most dynamic performers over the last three decades, recently released his latest album 'Earthlings.' (Photo credit should read VINCE BUCCI/AFP/Getty Images)

LONDON, UNITED KINGDOM - MAY 20: David Bowie, and wife Iman in London to launch his new Publication, and Publishing company, on May 20 1997, in London, United Kingdom. (Photo by UK Press via Getty Images)

David Bowie and wife Iman arrive at the 1999 MTV Music Video Awards held at the Metropolitan Opera House, Lincoln Center in New York City on September 9, 1999. (Photo by Frank Micelotta/ImageDirect)

David Bowie and Iman during 'Meet Joe Black' New York Premiere at Ziegfeld Theater in New York City, New York, United States. (Photo by Ke.Mazur/WireImage)

Musician David Bowie and model Iman attend Seventh on Sale AIDS Benefit on November 29, 1990 at the Armory in New York City. (Photo by Ron Galella/WireImage)

370128 01: (USA SALES ONLY) Iman (L) and David Bowie at a fund raiser for The Urban League in New York City, Nov. 23, 1999. (Photo by Iris Zimmerman/Online USA/Newsmakers)

David Bowie and wife Iman during David Bowie Concert at Roseland at Roseland in New York City, New York, United States. (Photo by KMazur/WireImage)

Iman and David Bowie at the gala benefit screening of the film 'Pollock' for the Film & Media Arts Program of the Guggenheim Museum, at the Guggenheim Museum in New York City. 11/20/2000 (Photo: Evan Agostini/ImageDirect)

Iman and David Bowie backstage during Tibet House Benefit Concert 2001 at Carnegie Hall in New York City, New York, United States. (Photo by KMazur/WireImage)

Iman and David Bowie (Photo by Dimitrios Kambouris/WireImage)

Iman & David Bowie (Photo by Jim Spellman/WireImage)

LONDON - JULY 9: Singer David Bowie and his wife Iman attend the Serpentine Gallery Summer Party at the Serpentine Gallery in Kensington Gardens July 9, 2002 in London, England. (Photo by John Li/Getty Images)

UNITED STATES - DECEMBER 09: Iman and husband David Bowie arrive at the Ziegfeld Theater for the premiere of the movie 'The Gangs of New York.' (Photo by Richard Corkery/NY Daily News Archive via Getty Images)

NEW YORK - FEBRUARY 3: Model Iman and husband, musician David Bowie attend the amFAR Benefit Honors Gala at Cipriani 42nd Street on February 3, 2003 in New York City. (Photo by Evan Agostini/Getty Images)

David Bowie and Iman during Liv Tyler's Wedding Reception - New York in West Village, New York City, New York, United States. (Photo by Bill Davila/FilmMagic)

David Bowie and Iman during Costume Institute Benefit Dance: 'Party of the Year' - Arrivals at Metropolitan Museum of Art in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage)

NEW YORK - MAY 1: (U.S. TABS AND HOLLYWOOD REPORTER OUT) Model Iman (L) and her husband musician David Bowie attend the Vanity Fair 2003 Tribeca Film Festival launch party at The State Supreme Courthouse May 1, 2003 in New York City. (Photo by Evan Agos

NEW YORK - MAY 5: (U.S. TABS AND HOLLYWOOD REPORTER OUT) Singer David Bowie (R) and his wife model Iman stand backstage at The Film Society of Lincoln Center's Tribute to Susan Sarandon at Avery Fisher Hall May 5, 2003 in New York City. (Photo by Evan Agostini/Getty Images)

Iman and David Bowie during Interview Celebrates The Publication of Andy Warhol's Interview: The Crystal Ball of Pop Culture - The Best of the First Decade 1969-1979 at Stephan Weiss Studio in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage)

Iman and David Bowie during 4th Annual Tribeca Film Festival - Vanity Fair Party at New York Supreme Court in New York City, New York, United States. (Photo by Michael Loccisano/FilmMagic)

NEW YORK - JUNE 06: Model Iman and her husband David Bowie attend the 2005 CFDA Awards at the New York Public Library June 6, 2005 in New York City. (Photo by Evan Agostini/Getty Images)

Iman and David Bowie at the Cipriani at 23rd St in New York, (Photo by Shawn Ehlers/WireImage)

NEW YORK - DECEMBER 01: (US TABS AND HOLLYWOOD REPORTER OUT) Singer David Bowie and his wife model Iman attend the Broadway opening of 'The Color Purple' at the Broadway Theatre December 1, 2005 in New York City. (Photo by Peter Kramer/Getty Images)

Iman and David Bowie during 5th Annual Tribeca Film Festival - Vanity Fair Party at The State Supreme Courthouse in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage)

NEW YORK - APRIL 24: Iman and husband David Bowie arrive for the Vanity Fair 2007 Tribeca Film Festival party at The State Supreme Courthouse April 24, 2007 in New York City. (Photo by Evan Agostini/Getty Images For Tribeca Film Festival)

David Bowie and Iman (Photo by Dimitrios Kambouris/WireImage)

NEW YORK - OCTOBER 25: Iman and David Bowie at The 4th Annual 'Black Ball'Concert for 'Keep A Child Alive' Arrivals (Photo by Theo Wargo/WireImage)

UNITED STATES - APRIL 23: David Bowie and Iman at the vanity fair Tribeca Film Festival Party held at The NY State Supreme Courthouse... (Photo by Richard Corkery/NY Daily News Archive via Getty Images)

(L-R) Model Iman and musician David Bowie attend the Metropolitan Museum of Art Costume Institute Gala 'Superheroes: Fashion And Fantasy' at the Metropolitan Museum of Art on May 5, 2008 in New York City. (Photo by Michael Loccisano/FilmMagic)

(EXCLUSIVE, Premium Rates Apply) NEW YORK - NOVEMBER 13: *Exclusive* (NO ITALY SALES) David Bowie and Iman inside Keep A Child Alive's 5th annual Black Ball at Hammerstein Ballroom on November 13, 2008 in New York City. (Photo by Kevin Mazur/WireImage)

NEW YORK - APRIL 30: Iman and Musician David Bowie attend the premiere of 'Moon' during the 8th Annual Tribeca Film Festival at BMCC Tribeca Performing Arts Center on April 30, 2009 in New York City. (Photo by Jim Spellman/WireImage)

(EXCLUSIVE, Premium Rates Apply) NEW YORK - OCTOBER 15: *Exclusive* Iman and David Bowie at Hammerstein Ballroom during Keep A Child Alive's 6th Annual Black Ball hosted by Alicia Keys and Padma Lakshmi on October 15, 2009 in New York City. (Photo by Kevin Mazur/WireImage)

NEW YORK - JUNE 07: Model Iman (L) and musician David Bowie attend the 2010 CFDA Fashion Awards at Alice Tully Hall, Lincoln Center on June 7, 2010 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

NEW YORK, NY - APRIL 28: Musician David Bowie and supermodel Iman attend the DKMS' 5th Annual Gala: Linked Against Leukemia honoring Rihanna & Michael Clinton hosted by Katharina Harf at Cipriani Wall Street on April 28, 2011 in New York City. (Photo by Andrew H. Walker/Getty Images for DKMS)

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Turns out, that worked. "After seven years trying without luck, Iman got pregnant!" Brinkley wrote. "So, beyond her great beauty and business savvy, and beyond Bowie's music and art, I always felt a sweet connection to this stunningly gorgeous and creative couple."